Tankless Water Heater Cost (2026 Pricing)

Last updated: March 2026

By the Plumbing Price Guide Team

A tankless water heater costs $2,500 to $5,500 installed in 2026, including the unit and labor. Also called on-demand or instantaneous water heaters, tankless units heat water only when a faucet or appliance calls for it, rather than storing a reservoir of pre-heated water. The total installed price depends on fuel type (gas or electric), the brand and flow rate of the unit, and the complexity of the installation.

These prices cover the cost of the tankless unit itself ($500 to $2,000), labor ($1,000 to $3,000), and basic installation materials. Additional costs may apply for gas line upgrades, new venting, electrical panel upgrades, permits, and removal of the old tank water heater. For a broader comparison of all water heater types and their costs, see the full water heater installation cost guide.

The sections below break down pricing by fuel type, explain why converting from tank to tankless costs more, compare major brands, and cover everything homeowners need to know before making a decision.

How Much Does a Tankless Water Heater Cost by Type?

The two main types of tankless water heaters are gas (natural gas or propane) and electric. Gas units cost more upfront but deliver higher flow rates and lower operating costs. Electric units are cheaper to buy and install but may not produce enough hot water for larger households. The table below shows 2026 pricing for each type.

Point-of-use electric units are small units installed under a single sink or at one fixture. They cost far less than whole-house systems but only serve one location. Homeowners sometimes pair a point-of-use unit with a central tank heater to solve long wait times at distant fixtures.

Condensing gas units capture exhaust heat that non-condensing units waste, achieving efficiency ratings of 90% or higher compared to 80% to 85% for non-condensing models. The higher efficiency means lower monthly operating costs, but the unit itself costs $300 to $700 more. Condensing units also use PVC venting instead of stainless steel, which can reduce installation costs. Non-condensing units require category III stainless steel venting that costs $300 to $800 for the vent run alone.

Propane tankless units cost slightly more than natural gas models because the burners and gas valves are configured differently. Operating costs are also higher in most areas because propane costs more per BTU than natural gas. However, propane is the only option for rural homes without natural gas service.

If the existing water heater is a tank model, switching to tankless typically adds $500 to $2,000 in conversion costs on top of the prices shown above. A straight tankless-to-tankless replacement is simpler and cheaper because the gas line, venting, and electrical connections are already in place.

Why Does Converting From Tank to Tankless Cost More?

Switching from a traditional tank water heater to a tankless unit is not a simple swap. The two systems have fundamentally different requirements for gas supply, venting, electrical service, and mounting. A plumber performing this conversion typically needs to address several upgrades that are not necessary when simply replacing a tank with another tank. This is why the water heater replacement cost for a tankless conversion runs higher.

Gas Line Upgrades

Tank water heaters typically use a 1/2-inch gas line. Tankless gas units require a 3/4-inch gas line because they burn up to 199,000 BTU to heat water on demand, compared to 30,000 to 50,000 BTU for a standard tank heater. Running a new, larger gas line from the meter to the unit costs $200 to $800 depending on the length of the run and whether it passes through finished walls.

Venting Changes

Tank water heaters use a standard B-vent that shares a chimney flue with the furnace in many homes. Tankless gas units cannot share a flue. Non-condensing tankless units require their own category III stainless steel vent that exits through the roof or a sidewall. This dedicated vent run costs $300 to $800 for materials and labor. Condensing tankless units use less expensive PVC venting, which can reduce this cost to $100 to $300.

Electrical Upgrades

Electric tankless water heaters draw significant amperage. A whole-house electric unit typically requires two to three 40-amp dedicated circuits, and many older homes have only 100 or 150-amp electrical panels. Upgrading to a 200-amp panel costs $1,500 to $3,000. Even gas tankless units need a standard 120-volt outlet nearby for the electronic ignition and control board.

Mounting and Plumbing Modifications

Tank water heaters sit on the floor. Tankless units mount on the wall, often in a different location than the old tank. The plumber may need to reroute water supply lines, install new shut-off valves, and add a condensate drain (for condensing models). These plumbing modifications cost $100 to $400.

Removing the Old Tank

Draining, disconnecting, and hauling away the old tank water heater adds $50 to $200 to the project. Some plumbers include this in their installation quote; others charge it separately. If the old tank contained sediment or corrosion, cleanup adds time and cost.

Not every conversion requires all of these upgrades. A home that already has a 3/4-inch gas line and a 200-amp panel will avoid the most expensive line items. The plumber should evaluate the existing infrastructure during a pre-installation visit and provide an itemized quote before work begins. Homeowners can learn more about what to expect from the installation process in the guide to finding a good plumber.

How to Size a Tankless Water Heater

Tankless water heaters are sized by flow rate, measured in gallons per minute (GPM), and by temperature rise, measured in degrees Fahrenheit. Unlike tank heaters, which are sized by storage capacity (40 gallons, 50 gallons, etc.), tankless units must be able to heat enough water at the exact moment it is needed. Choosing the wrong size results in lukewarm water during peak demand.

Step 1: Add Up Your Peak Flow Rate

Determine how many hot water fixtures you expect to run simultaneously at peak usage. Each fixture has a typical flow rate. A standard shower head uses about 2.0 GPM. A kitchen faucet uses about 1.5 GPM. A dishwasher uses about 1.5 GPM. A clothes washer uses about 2.0 GPM. A bathroom faucet uses about 1.0 GPM.

If the maximum simultaneous demand is a shower (2.0 GPM) plus a kitchen faucet (1.5 GPM), the required flow rate is 3.5 GPM. If two showers might run at the same time along with a dishwasher, the requirement jumps to 5.5 GPM.

Step 2: Calculate Required Temperature Rise

Temperature rise is the difference between the incoming groundwater temperature and the desired output temperature (typically 120 degrees Fahrenheit). In warmer climates, groundwater enters at 60 to 70 degrees, requiring a 50 to 60 degree rise. In colder climates, groundwater enters at 35 to 45 degrees, requiring a 75 to 85 degree rise. Colder climates need a more powerful unit to achieve the same flow rate.

Sizing Recommendations

Gas tankless units deliver 8 to 11 GPM at a 35-degree temperature rise, making them suitable as a single whole-house unit for most homes. Electric units max out at 3 to 5 GPM, which is often insufficient for simultaneous use. Larger households with electric tankless often install two units in parallel or pair a whole-house unit with point-of-use units at high-demand fixtures.

A qualified plumber will perform a full sizing calculation that accounts for local groundwater temperature, the number and type of fixtures, and the household's usage patterns. Oversizing wastes money on a more expensive unit, while undersizing leads to complaints about inadequate hot water.

Tankless Water Heater Brand Comparison

The brand of tankless water heater affects both the upfront cost and the long-term reliability of the system. The table below compares the most popular brands available in 2026, including their typical unit cost, flow rate range, and warranty coverage. All prices are for the unit only, before installation labor.

Rinnai is the most widely installed brand in North America, with extensive dealer networks and easy access to replacement parts. Navien has gained significant market share with its condensing technology and competitive pricing. Noritz and Takagi are Japanese manufacturers with long track records of reliability. Rheem offers mid-range options in both gas and electric and is widely available at home improvement stores.

For electric tankless, Stiebel Eltron (German-made) is considered the premium option, while EcoSmart is the most affordable and offers a lifetime warranty on the heat exchanger, though the warranty is limited and does not cover labor. Homeowners should verify that the chosen brand has a local authorized service provider, since warranty work often must be performed by a certified technician.

Condensing models from Navien and Rinnai recapture heat from the exhaust gases, achieving energy factors above 0.90. Non-condensing models have energy factors of 0.80 to 0.85. The higher efficiency of condensing units translates to roughly $50 to $100 per year in additional gas savings compared to non-condensing units.

How Much Does a Tankless Water Heater Save Per Year?

One of the primary reasons homeowners consider a tankless water heater is the promise of lower energy bills. Tank water heaters maintain a reservoir of hot water 24 hours a day, losing heat through the tank walls even when no hot water is being used. This standby heat loss accounts for 20% to 30% of a tank heater's total energy consumption. Tankless units eliminate standby loss entirely because they only fire when hot water is demanded.

According to the U.S. Department of Energy, tankless water heaters are 24% to 34% more efficient than tank water heaters for households that use 41 gallons or less of hot water per day. For households that use more (around 86 gallons per day), the efficiency advantage narrows to 8% to 14%.

The savings depend heavily on usage patterns. A household of one or two people who uses relatively little hot water sees the largest percentage savings because standby loss makes up a bigger share of total energy use. Larger families with heavy hot water demand still save money, but the percentage improvement is smaller because the tankless unit is firing more frequently.

Over a 20-year lifespan (which is typical for a well-maintained tankless unit), the cumulative energy savings of $2,000 to $3,000 offset a significant portion of the higher upfront cost. When combined with a longer lifespan (homeowners avoid buying a second tank heater), the total cost of ownership for tankless is often comparable to or lower than a traditional tank heater.

Tank vs Tankless: Full Comparison

The decision between a tank and tankless water heater involves more than just upfront cost. The table below provides a side-by-side comparison of every factor homeowners should weigh. For more detail on overall water heater installation cost, see the full guide.

Tank water heaters win on upfront affordability and installation simplicity. They are the right choice for homeowners who plan to sell the home within a few years or who need to minimize the immediate out-of-pocket cost. Tankless units win on lifespan, energy efficiency, unlimited hot water, and space savings. They are the better long-term investment for homeowners who plan to stay in the home for 10 or more years.

If the existing water heater has failed and needs immediate replacement, the decision often comes down to budget and timeline. A tank replacement can be completed in two to four hours. A tank-to-tankless conversion may take a full day and cost $1,000 to $2,000 more. For homes that already have tankless, replacing with a new tankless unit is comparable in cost and time to a tank replacement. For more on repair vs. replacement decisions, see the water heater repair cost guide.

When Does a Tankless Water Heater NOT Make Sense?

Despite its advantages, a tankless water heater is not the right choice for every home or situation. Homeowners should consider the following scenarios where a traditional tank water heater may be the better option.

Short-Term Homeownership

The break-even point for a tankless unit is typically 6 to 12 years, factoring in the higher upfront cost offset by annual energy savings. Homeowners who plan to move within five years are unlikely to recoup the extra investment. A new tank water heater provides reliable service at a much lower initial cost.

Very Hard Water

Hard water (above 120 ppm of dissolved minerals) causes scale buildup inside the heat exchanger much faster than in a tank. Without frequent descaling (every 6 to 12 months in hard water areas), the heat exchanger can fail prematurely. The added maintenance cost and effort reduce the financial advantage of going tankless. Homeowners in hard water areas should factor in the cost of a water softener or more frequent professional descaling.

High Simultaneous Demand Without Adequate Budget

A large household with three or more bathrooms and frequent simultaneous hot water use may need a high-output gas unit (10+ GPM) or multiple units installed in parallel. The cost of two tankless units ($5,000 to $10,000 installed) can make a large-capacity tank heater (75 to 80 gallons at $1,500 to $3,000 installed) a significantly more economical choice.

Homes Without Natural Gas

All-electric homes face a particular challenge with tankless because electric units have lower flow rates (3 to 5 GPM) and often require a 200-amp panel. If the panel upgrade costs $1,500 to $3,000 and two electric units are needed, the total installed cost ($4,000 to $8,000) far exceeds a single large electric tank heater ($700 to $2,000 installed). A heat pump water heater is often a better option for all-electric homes.

Budget Constraints

When the priority is minimizing upfront cost, a tank water heater is almost always the answer. A 50-gallon gas tank heater can be installed for $800 to $1,500, which is less than half the cost of most whole-house tankless installations. The energy savings from tankless are real but modest ($100 to $150 per year), and they take years to add up.

Regional Price Variation for Tankless Installation

Tankless water heater installation costs vary across the country based on local labor rates, permit fees, and market conditions. The table below shows how regional pricing compares to the national average of $3,800 installed. Use the plumbing cost calculator to estimate costs in your area.

The West Coast and Northeast are the most expensive regions for tankless installation due to higher labor rates, stricter building codes, and elevated cost of living. In major metro areas like San Francisco, New York, and Boston, prices can exceed the regional average by an additional 10% to 20%.

The Southeast and South Central regions tend to have the lowest tankless installation costs. Lower labor rates and less complex venting requirements (due to warmer climates and the prevalence of exterior wall-mounted installations) contribute to the savings. Additionally, warmer groundwater temperatures in southern states mean smaller, less expensive units can deliver adequate performance.

Colder climates affect not only labor costs but also unit sizing. In states like Minnesota, Wisconsin, and Maine, groundwater temperatures can be as low as 35 to 40 degrees Fahrenheit. The tankless unit must work harder to achieve the required temperature rise, which means homeowners need a higher-output (and more expensive) model. This sizing consideration adds $200 to $500 to the unit cost compared to warmer states where a smaller model suffices.

For a breakdown of plumber cost per hour by region, which directly affects installation labor pricing, see the dedicated guide.

Maintenance: What Does Tankless Descaling Cost?

Regular maintenance is essential for tankless water heaters to perform efficiently and reach their full 20 to 25 year lifespan. The primary maintenance task is descaling (also called deliming or flushing), which removes mineral buildup from the heat exchanger. Without descaling, mineral deposits restrict water flow, reduce efficiency, and eventually cause the heat exchanger to overheat and crack.

Professional Descaling

A licensed plumber charges $150 to $300 per descaling service. The process takes about one hour and involves circulating a vinegar or citric acid solution through the heat exchanger using a pump. Most manufacturers recommend descaling every 12 months. In hard water areas (above 120 ppm), every 6 months is advisable.

DIY Descaling

Many homeowners descale their own tankless water heater using a descaling kit that costs $30 to $60 and includes a submersible pump, hoses, and descaling solution (white vinegar works as well). The process takes 45 minutes to an hour. Most tankless units have built-in isolation valves that make DIY descaling straightforward. Performing this task yourself saves $120 to $270 per year in service fees.

Other Maintenance Tasks

Beyond descaling, tankless water heaters require cleaning the inlet water filter every 6 to 12 months (a five-minute task), checking the venting system annually for blockages or corrosion, and testing the pressure relief valve. A comprehensive annual maintenance visit that includes descaling, filter cleaning, and system inspection costs $200 to $400 from a licensed plumber.

Neglecting maintenance voids most manufacturer warranties and shortens the unit's lifespan from 20+ years to as little as 8 to 12 years. Homeowners who stay on top of descaling can expect their tankless unit to last well beyond 20 years. The water heater age decoder tool can help determine the age and expected remaining life of an existing unit.

Permits and Code Requirements

Almost every jurisdiction in the United States requires a permit for water heater installation, whether tank or tankless. Tankless installations often involve additional code requirements because of the gas line, venting, and electrical modifications involved.

Permit Costs

A plumbing permit for a tankless water heater installation costs $50 to $300 depending on the municipality. Some jurisdictions also require a separate gas permit ($50 to $150) if gas line modifications are performed, and an electrical permit ($50 to $200) if panel upgrades are needed. A licensed plumber typically handles the permit application and schedules the required inspections.

Common Code Requirements

Building codes for tankless water heater installation typically address several areas. Gas supply sizing must be adequate for the unit's BTU rating. Venting must terminate at the correct distance from windows, doors, and property lines. Combustion air supply must meet the requirements in the fuel gas code. A temperature and pressure relief valve must be installed and piped to an approved drain location. A sediment trap must be installed on the gas supply line. Electrical connections must comply with the National Electrical Code.

Inspection

After installation, a building inspector verifies that the work meets code. The inspection typically takes 15 to 30 minutes and covers gas line sizing, venting clearances, electrical connections, and proper drainage. If the installation fails inspection, the plumber must correct any deficiencies and schedule a re-inspection, which may involve an additional fee of $50 to $100.

Homeowners should never hire an unlicensed contractor for tankless installation. Besides the safety risks of improper gas and venting work, unpermitted installations can create problems when selling the home and may void the manufacturer's warranty. Always verify that the plumber holds the appropriate license for your state and municipality.

Rebates and Tax Credits for Tankless Water Heaters

Federal, state, and utility incentives can significantly reduce the net cost of a tankless water heater. These programs are designed to encourage homeowners to upgrade to more energy-efficient equipment and reduce overall energy consumption.

Federal Tax Credits

Under the Inflation Reduction Act, homeowners may claim a tax credit for qualifying high-efficiency water heaters. For 2026, gas tankless water heaters with a Uniform Energy Factor (UEF) of 0.95 or higher qualify for a federal tax credit of up to $2,000 as part of the annual $3,200 home energy efficiency tax credit cap. This credit applies to the installed cost, including labor. The unit must be installed in the taxpayer's primary residence.

State and Local Rebates

Many states offer additional rebates for high-efficiency water heaters. These range from $100 to $500 depending on the state and the efficiency of the unit. Check your state's energy office website or the Database of State Incentives for Renewables and Efficiency (DSIRE) for current offerings.

Utility Rebates

Gas and electric utilities frequently offer rebates of $50 to $300 for high-efficiency water heaters. These rebates change frequently and vary by utility. Contact your gas or electric provider directly or check their website for current rebate programs. Some utilities also offer low-interest financing for energy-efficient upgrades.

Potential Savings Breakdown

In the best case, a homeowner installing a qualifying condensing gas tankless unit could receive $2,000 in federal tax credits, $300 in state rebates, and $200 in utility rebates, reducing the net cost from $4,000 to $1,500. Not all homeowners will qualify for the maximum incentives, but it is worth researching available programs before making a purchase. The plumber or a tax professional can help identify which credits and rebates apply.

Keep all receipts and manufacturer specification sheets, as these are required when claiming tax credits. The manufacturer's label or spec sheet must show the UEF rating and confirm that the unit meets Energy Star certification requirements.

Frequently Asked Questions

How much does a tankless water heater cost installed?

A gas tankless water heater costs $3,000 to $5,500 installed. An electric tankless costs $1,500 to $3,500 installed. The unit itself runs $500 to $2,000 depending on brand and flow rate. Installation labor adds $1,000 to $3,000.

Is a tankless water heater worth the extra cost?

Tankless units save $100 to $150 per year in energy costs and last 20+ years vs 10 to 15 for tank units. The break-even point on the higher upfront cost is typically 6 to 12 years. Homeowners who plan to stay in the home long-term generally see a positive return on the investment.

Why does tankless installation cost more than a tank water heater?

Converting from tank to tankless often requires upgrading the gas line from 1/2 inch to 3/4 inch, installing new category III stainless steel venting, upgrading the electrical panel for electric units, and removing the old tank. These modifications add $500 to $2,000 to the project cost beyond the price of the unit and standard labor. See the full breakdown in the water heater replacement cost guide.

How long does a tankless water heater last?

A tankless water heater lasts 20 to 25 years with proper maintenance. The heat exchanger is the component most likely to fail. Annual descaling extends lifespan significantly by preventing mineral buildup from damaging the heat exchanger.

What size tankless water heater do I need?

A 2-bathroom home needs roughly 6 to 8 GPM for a gas unit. Electric units have lower flow rates and may require two units for the same household. Your plumber calculates size based on the number of fixtures, expected simultaneous usage, and incoming water temperature.

Do tankless water heaters need maintenance?

Yes. Tankless units need descaling every 1 to 2 years to remove mineral buildup from the heat exchanger. Professional descaling costs $150 to $300. DIY descaling with a vinegar flush kit costs about $30. Homes with hard water need more frequent descaling, sometimes every 6 months.

What are the downsides of tankless water heaters?

The main downsides are higher upfront cost ($1,000 to $2,000 more than a tank unit), the cold water sandwich effect (a brief burst of cold water between hot water draws), potential inability to keep up with very high simultaneous demand in large households, and required annual descaling maintenance that tank heaters do not need.

Gas or electric tankless: which is better?

Gas tankless heaters have higher flow rates (8 to 11 GPM vs 3 to 5 GPM for electric) and lower operating costs per BTU. Electric units cost less to purchase and install and work well for small households or as point-of-use units. Gas is generally better for whole-house applications where multiple fixtures may run simultaneously.

Can I install a tankless water heater myself?

No. Gas units require gas line modifications and venting that must meet local building code. Electric units often require a 200-amp panel upgrade, which is electrical work that must be done by a licensed electrician. Both types require a permit and inspection in most jurisdictions. Improper installation creates safety hazards and voids the manufacturer's warranty.

Which tankless water heater brands are best?

Rinnai, Navien, and Noritz are the most widely recommended brands for gas tankless water heaters. Rheem offers good mid-range options in both gas and electric. For electric tankless, Stiebel Eltron and EcoSmart are the most popular. All major brands offer 10 to 15 year heat exchanger warranties. Choose a brand with a strong local dealer and service network to simplify future maintenance and warranty claims.

Related Resources

• Water Heater Installation Cost (All Types)
• Water Heater Replacement Cost
• Water Heater Repair Cost
• Water Heater Age Decoder
• Plumbing Cost Guide
• Plumbing Cost Calculator
• How to Find a Good Plumber
• Plumber Cost Per Hour